Low Emissions Technologies Research and Development Partnership

Sandia Corporation

Low Emmissions Technologies Research and Development Partnership

Linda I McLaughlin

Timothy J Gardner

Stephen E Lott

Steven J Lockwood

Deborah L Mowery-Evans

Charlene A Matlock

John B Oelfke

A method for catalytically reducing nitrogen oxide compounds (NO, defined as nitric oxide, NO, +nitrogen dioxide, NO) in a gas by a material comprising a base metal consisting essentially of CuO and Mn, and oxides of Mn, on an activated metal hydrous metal oxide support, such as HMO:Si. A promoter, such as tungsten oxide or molybdenum oxide, can be added and has been shown to increase conversion efficiency. This method provides good conversion of NOto N, good selectivity, good durability, resistance to SOaging and low toxicity compared with methods utilizing vanadia-based catalysts.

Method for selective catalytic reduction of nitrogen oxides

Disclosed is a catalytic material of a calcined noble metal-doped hydrous titanium oxide with a copper promoter compound. The catalytic material is effective for NO.sub.x reduction in an oxidizing exhaust stream form a combustion process is disclosed. Also described is a device for reduction of nitrogen oxides in an exhaust stream, particularly an automotive exhaust stream, that includes a substrate coated with the activated noble-metal doped hydrous metal oxide of the invention and methods for preparing the device.

Material and system for catalytic reduction of nitrogen oxide in an

A catalytic material of activated hydrous metal oxide doped with platinum, palladium, or a combination of these, and optionally containing an alkali or alkaline earth metal, that is effective for NO.sub.X reduction in an oxidizing exhaust stream from a combustion process is disclosed. A device for reduction of nitrogen oxides in an exhaust stream, particularly an automotive exhaust stream, the device having a substrate coated with the activated noble-metal doped hydrous metal oxide of the invention is also provided.

A material effective for adsorbing NO.sub.x from an exhaust stream of a combustion process, such as from an internal combustion engine operating under lean burn conditions, is disclosed. The material comprises an alkali metal-doped and copper-doped hydrous metal oxide material that has been calcined. The alkali metal is selected from potassium and sodium. The material is coated onto a substrate, such as ceramic beads or pellets, or a honeycomb cordierite monolith, and placed in contact with the exhaust stream.

Growing community of inventors

Albuquerque, NM, United States of America

Linda I McLaughlin